Internal systems · Mains networks · Tanks

Pipework disinfection
and mains networks

Complete disinfection of internal cold and hot water systems, mains networks and storage tanks. Chemical, thermal or combined — with full sanitary documentation meeting the requirements of the sanitary inspectorate and the fire service.

24hlaboratory test results
100%documentation for the sanitary inspectorate
3 methodsthermal, ClO₂, chlorination
od 2009years of industry experience
When we act

When does a system need
disinfection?

Hot and cold water systems are an environment where biofilm, Legionella and other microorganisms thrive. Dead legs, stagnant water, an inadequate hot water temperature or ageing pipework are all risk factors that call for action.

The Ministry of Health regulation and sanitary inspectorate guidance impose an obligation to disinfect regularly on public buildings, hospitals, hotels, swimming pools and workplaces.

  • A water test result outside the limits
  • A system after refurbishment, alteration or a longer period out of use
  • Commissioning a new building or system
  • A scheduled sanitary inspection for the sanitary inspectorate or Sanepid
  • A mains failure or flooding of the premises
  • Seasonal opening of a property (hotel, resort, swimming pool)
Kiedy instalacja wodna wymaga dezynfekcji — wewnętrzne rury i punkty czerpalne wymagające interwencji (ilustracja wygenerowana z pomocą AI)
Scope

What does system disinfection cover?

Step 1

Inspection and risk assessment

Inspection of the system, a survey of draw-off points, identification of dead legs and stagnation zones. Assessment of hot and cold water temperatures.

  • System schematic and risk map
  • Hot water temperature measured on every riser
  • Identification of dead legs
  • Assessment of the condition of the fittings
  • Recommendation of a disinfection method
Step 2

The disinfection itself

Disinfection using the chosen method (thermal, ClO₂, shock chlorination or a combination). Full exposure of every draw-off point.

  • Disinfection of every draw-off point
  • Parameters monitored in real time
  • Exposure of dead legs and capped ends
  • Disinfection of tanks and pressure vessels
  • Safe discharge of post-disinfection water
Step 3

Testing and documentation

Water sampling before and after disinfection. Analysis at the accredited GBA Polska laboratory. Full documentation for Sanepid.

  • Sampling by a certified technician
  • Analysis by GBA Polska — a PCA-accredited laboratory
  • Results within 24–48 hours
  • Disinfection report and analysis
  • Archived documentation for the sanitary inspectorate and fire service
Who it is for

Which properties do we serve?

Hotels and guesthouses

Mandatory disinfection of hot and cold water — Legionella, the sanitary inspectorate and regular reports.

Hospitals and clinics

A critical environment — full documentation and a Legionella risk management plan.

Apartment blocks

Disinfection of hot and cold water risers for property managers and housing associations.

Swimming pools and spa facilities

Pool installations and communal showers — disinfection and microbiological monitoring.

Industrial plants

Process water, cooling systems, storage tanks and cooling towers.

New developments

Handover of a system after construction — disinfection before it is signed off for use and first filled.

Questions and answers

Frequently asked questions

How long does disinfection take in an apartment block?

The time depends on the size of the building and the number of risers. A standard block (10 floors, 4 stairwells) usually takes 4–8 hours. The water is off in the section being disinfected while the work is under way. We agree the schedule with the property manager or administrator at least 72 hours in advance.

Does the building have to be empty during disinfection?

No — disinfection does not require the building to be emptied. During the procedure itself we temporarily shut off the water supply to the riser or section concerned. Residents receive advance notice of the planned interruption.

What documentation will I receive after disinfection?

We provide complete documentation: a disinfection report with the technical parameters, a results sheet (concentrations, temperatures, exposure time), the GBA Polska laboratory analysis report, a schematic of the system marking the sampling points, and a certificate of completion. The documents are recognised by the sanitary inspectorate, Sanepid and the fire service.

Does MICHLOR handle external (mains) networks?

Yes — we disinfect water service connections, deep wells, balancing tanks and estate networks. For new sections of network we carry out the required disinfection before technical acceptance and connection to the municipal network.

How often should a water system be disinfected?

For public buildings (hotels, hospitals, swimming pools) — at least once a year, or after any unfavourable test result. For apartment blocks — recommended every 2–3 years, or after the pipework has been refurbished. The exact frequency depends on microbiological test results and the Legionella risk assessment.

We are here to help

Any questions?
Call or write to us.

We work across Mazovia, Łódź, Podlasie and the Lublin region. We reply the same working day.

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